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@einen tetes stwt @frn WRIGHT" SMITH, OFQSVT.,LOUIS, MISSOURI.

Letters PatentNo. 76,540, dated April 7, 1868,.

vIMPROVIJD BRICK FOR BUILDING PURPOSES.`

TO ALL WHOM Ill.'V MAY (.lOlVCliiRl:l i

Be it known that I, WRIGHT SMITH, of St. Louis, in the county of St. Louis, and State of Missouri, have made certain new and useful Improvementsvin Bricks for Building Purposes; .and I do hereby declare that the` following is a. full and clear description thereof, reference being hadto the accompanying drawings, and to'the letters of -reference marked thereon. The object of this invention is to construct bricks in such a manner as to furnish dove-tailed cavitiesv for the reception of the clinchings of the plastering-mortar-with which-the walls may be covered. This construction of the bricks is eminently adapted to the construction of buildings which are to be covered with an external coating of mastic.

To lenable those skilled in the art to make and use my improved bricks, I willproceed to describe their construction and operation. s v Figure 1 of the drawings is aperspective view of a section of wall built with thelimproved bricks.

Figure 2 is an enlarged elevation of one brick. v

Each individual brick, A; isi'ormed in the usual manner, and of the usual size of bricks for building pur,- poses. In one edge of eachbrick is made a cavity, a, say one-quarter of an inch deep, more oir less, and about one and a half inch wide at the bas-e, and terminating-in\ a curved contour at its upper end, which reaches to ,within about one-quarter of the width of the brick of its tdp edge. The sloping sides ofthe cavities a arel to be dove-tailed, so as to `present re-entering angles for the reception and detention of the mortar which is to,

cover the face of the wall. The lower corners of the sloping sides should be bevelled back, as shownvat ai in iig. 2, so as to afford opportunity for entering the point of a' trowel, to clean the mortar out of the joint at the for-the purpose described.

time of laying the bricks in the wall. The bricks which are to be used in building the salient angles of walls should have the cavities a in their ends as well as sides; The bricks which are made for this purpose should have the cavities in both ends, so as to avoid ythe necessity of both right and left-hand bricks. `When laid in the walls, the bric-ks should be so placed as to have the open* large end of' the cavities'atthe bottom, forthe piirpose of preventing the inortar from .falling into the dove-tniling. y i I Y i Having fully-described my invention, what I claim is`- The brick A, whenprovided with the doveftailed mortar-cavities a, extending across a portion only of the depth of the brick, the same being in shape daring at the bottom andharrowcr at the top', lsubstantially as and WRIGHT SMITH. p

Witnesses:

H. PAULI, M. RANDOLPH. 

